net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211's connect emulation.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/etherdevice.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/slab.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/wireless.h>
  13 #include <linux/export.h>
  14 #include <net/iw_handler.h>
  15 #include <net/cfg80211.h>
  16 #include <net/rtnetlink.h>
  17 #include "nl80211.h"
  18 #include "reg.h"
  19 #include "rdev-ops.h"
  20
  21 struct cfg80211_conn {
  22         struct cfg80211_connect_params params;
  23         /* these are sub-states of the _CONNECTING sme_state */
  24         enum {
  25                 CFG80211_CONN_IDLE,
  26                 CFG80211_CONN_SCANNING,
  27                 CFG80211_CONN_SCAN_AGAIN,
  28                 CFG80211_CONN_AUTHENTICATE_NEXT,
  29                 CFG80211_CONN_AUTHENTICATING,
  30                 CFG80211_CONN_ASSOCIATE_NEXT,
  31                 CFG80211_CONN_ASSOCIATING,
  32                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  33         } state;
  34         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  35         u8 *ie;
  36         size_t ie_len;
  37         bool auto_auth, prev_bssid_valid;
  38 };
  39
  40 static bool cfg80211_is_all_idle(void)
  41 {
  42         struct cfg80211_registered_device *rdev;
  43         struct wireless_dev *wdev;
  44         bool is_all_idle = true;
  45
  46         mutex_lock(&cfg80211_mutex);
  47
  48         /*
  49          * All devices must be idle as otherwise if you are actively
  50          * scanning some new beacon hints could be learned and would
  51          * count as new regulatory hints.
  52          */
  53         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  54                 cfg80211_lock_rdev(rdev);
  55                 list_for_each_entry(wdev, &rdev->wdev_list, list) {
  56                         wdev_lock(wdev);
  57                         if (wdev->sme_state != CFG80211_SME_IDLE)
  58                                 is_all_idle = false;
  59                         wdev_unlock(wdev);
  60                 }
  61                 cfg80211_unlock_rdev(rdev);
  62         }
  63
  64         mutex_unlock(&cfg80211_mutex);
  65
  66         return is_all_idle;
  67 }
  68
  69 static void disconnect_work(struct work_struct *work)
  70 {
  71         if (!cfg80211_is_all_idle())
  72                 return;
  73
  74         regulatory_hint_disconnect();
  75 }
  76
  77 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  78
  79 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  80 {
  81         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  82         struct cfg80211_scan_request *request;
  83         int n_channels, err;
  84
  85         ASSERT_RTNL();
  86         ASSERT_RDEV_LOCK(rdev);
  87         ASSERT_WDEV_LOCK(wdev);
  88         lockdep_assert_held(&rdev->sched_scan_mtx);
  89
  90         if (rdev->scan_req)
  91                 return -EBUSY;
  92
  93         if (wdev->conn->params.channel) {
  94                 n_channels = 1;
  95         } else {
  96                 enum ieee80211_band band;
  97                 n_channels = 0;
  98
  99                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 100                         if (!wdev->wiphy->bands[band])
 101                                 continue;
 102                         n_channels += wdev->wiphy->bands[band]->n_channels;
 103                 }
 104         }
 105         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 106                           sizeof(request->channels[0]) * n_channels,
 107                           GFP_KERNEL);
 108         if (!request)
 109                 return -ENOMEM;
 110
 111         if (wdev->conn->params.channel)
 112                 request->channels[0] = wdev->conn->params.channel;
 113         else {
 114                 int i = 0, j;
 115                 enum ieee80211_band band;
 116                 struct ieee80211_supported_band *bands;
 117                 struct ieee80211_channel *channel;
 118
 119                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 120                         bands = wdev->wiphy->bands[band];
 121                         if (!bands)
 122                                 continue;
 123                         for (j = 0; j < bands->n_channels; j++) {
 124                                 channel = &bands->channels[j];
 125                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 126                                         continue;
 127                                 request->channels[i++] = channel;
 128                         }
 129                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 130                 }
 131                 n_channels = i;
 132         }
 133         request->n_channels = n_channels;
 134         request->ssids = (void *)&request->channels[n_channels];
 135         request->n_ssids = 1;
 136
 137         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 138                 wdev->conn->params.ssid_len);
 139         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 140
 141         request->wdev = wdev;
 142         request->wiphy = &rdev->wiphy;
 143         request->scan_start = jiffies;
 144
 145         rdev->scan_req = request;
 146
 147         err = rdev_scan(rdev, request);
 148         if (!err) {
 149                 wdev->conn->state = CFG80211_CONN_SCANNING;
 150                 nl80211_send_scan_start(rdev, wdev);
 151                 dev_hold(wdev->netdev);
 152         } else {
 153                 rdev->scan_req = NULL;
 154                 kfree(request);
 155         }
 156         return err;
 157 }
 158
 159 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 160 {
 161         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 162         struct cfg80211_connect_params *params;
 163         struct cfg80211_assoc_request req = {};
 164         int err;
 165
 166         ASSERT_WDEV_LOCK(wdev);
 167
 168         if (!wdev->conn)
 169                 return 0;
 170
 171         params = &wdev->conn->params;
 172
 173         switch (wdev->conn->state) {
 174         case CFG80211_CONN_SCAN_AGAIN:
 175                 return cfg80211_conn_scan(wdev);
 176         case CFG80211_CONN_AUTHENTICATE_NEXT:
 177                 BUG_ON(!rdev->ops->auth);
 178                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 179                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 180                                             params->channel, params->auth_type,
 181                                             params->bssid,
 182                                             params->ssid, params->ssid_len,
 183                                             NULL, 0,
 184                                             params->key, params->key_len,
 185                                             params->key_idx, NULL, 0);
 186         case CFG80211_CONN_ASSOCIATE_NEXT:
 187                 BUG_ON(!rdev->ops->assoc);
 188                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 189                 if (wdev->conn->prev_bssid_valid)
 190                         req.prev_bssid = wdev->conn->prev_bssid;
 191                 req.ie = params->ie;
 192                 req.ie_len = params->ie_len;
 193                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 194                 req.crypto = params->crypto;
 195                 req.flags = params->flags;
 196                 req.ht_capa = params->ht_capa;
 197                 req.ht_capa_mask = params->ht_capa_mask;
 198                 req.vht_capa = params->vht_capa;
 199                 req.vht_capa_mask = params->vht_capa_mask;
 200
 201                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 202                                             params->bssid, params->ssid,
 203                                             params->ssid_len, &req);
 204                 if (err)
 205                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 206                                                NULL, 0,
 207                                                WLAN_REASON_DEAUTH_LEAVING,
 208                                                false);
 209                 return err;
 210         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 211                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 212                                        NULL, 0,
 213                                        WLAN_REASON_DEAUTH_LEAVING, false);
 214                 /* return an error so that we call __cfg80211_connect_result() */
 215                 return -EINVAL;
 216         default:
 217                 return 0;
 218         }
 219 }
 220
 221 void cfg80211_conn_work(struct work_struct *work)
 222 {
 223         struct cfg80211_registered_device *rdev =
 224                 container_of(work, struct cfg80211_registered_device, conn_work);
 225         struct wireless_dev *wdev;
 226         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 227
 228         rtnl_lock();
 229         cfg80211_lock_rdev(rdev);
 230         mutex_lock(&rdev->devlist_mtx);
 231
 232         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 233                 wdev_lock(wdev);
 234                 if (!netif_running(wdev->netdev)) {
 235                         wdev_unlock(wdev);
 236                         continue;
 237                 }
 238                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 239                         wdev_unlock(wdev);
 240                         continue;
 241                 }
 242                 if (wdev->conn->params.bssid) {
 243                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 244                         bssid = bssid_buf;
 245                 }
 246                 if (cfg80211_conn_do_work(wdev))
 247                         __cfg80211_connect_result(
 248                                         wdev->netdev, bssid,
 249                                         NULL, 0, NULL, 0,
 250                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 251                                         false, NULL);
 252                 wdev_unlock(wdev);
 253         }
 254
 255         mutex_unlock(&rdev->devlist_mtx);
 256         cfg80211_unlock_rdev(rdev);
 257         rtnl_unlock();
 258 }
 259
 260 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 261 {
 262         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 263         struct cfg80211_bss *bss;
 264         u16 capa = WLAN_CAPABILITY_ESS;
 265
 266         ASSERT_WDEV_LOCK(wdev);
 267
 268         if (wdev->conn->params.privacy)
 269                 capa |= WLAN_CAPABILITY_PRIVACY;
 270
 271         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 272                                wdev->conn->params.bssid,
 273                                wdev->conn->params.ssid,
 274                                wdev->conn->params.ssid_len,
 275                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 276                                capa);
 277         if (!bss)
 278                 return NULL;
 279
 280         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 281         wdev->conn->params.bssid = wdev->conn->bssid;
 282         wdev->conn->params.channel = bss->channel;
 283         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 284         schedule_work(&rdev->conn_work);
 285
 286         return bss;
 287 }
 288
 289 static void __cfg80211_sme_scan_done(struct net_device *dev)
 290 {
 291         struct wireless_dev *wdev = dev->ieee80211_ptr;
 292         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 293         struct cfg80211_bss *bss;
 294
 295         ASSERT_WDEV_LOCK(wdev);
 296
 297         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 298                 return;
 299
 300         if (!wdev->conn)
 301                 return;
 302
 303         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 304             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 305                 return;
 306
 307         bss = cfg80211_get_conn_bss(wdev);
 308         if (bss) {
 309                 cfg80211_put_bss(&rdev->wiphy, bss);
 310         } else {
 311                 /* not found */
 312                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 313                         schedule_work(&rdev->conn_work);
 314                 else
 315                         __cfg80211_connect_result(
 316                                         wdev->netdev,
 317                                         wdev->conn->params.bssid,
 318                                         NULL, 0, NULL, 0,
 319                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 320                                         false, NULL);
 321         }
 322 }
 323
 324 void cfg80211_sme_scan_done(struct net_device *dev)
 325 {
 326         struct wireless_dev *wdev = dev->ieee80211_ptr;
 327
 328         wdev_lock(wdev);
 329         __cfg80211_sme_scan_done(dev);
 330         wdev_unlock(wdev);
 331 }
 332
 333 void cfg80211_sme_rx_auth(struct net_device *dev,
 334                           const u8 *buf, size_t len)
 335 {
 336         struct wireless_dev *wdev = dev->ieee80211_ptr;
 337         struct wiphy *wiphy = wdev->wiphy;
 338         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 339         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 340         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 341
 342         ASSERT_WDEV_LOCK(wdev);
 343
 344         /* should only RX auth frames when connecting */
 345         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 346                 return;
 347
 348         if (WARN_ON(!wdev->conn))
 349                 return;
 350
 351         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 352             wdev->conn->auto_auth &&
 353             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 354                 /* select automatically between only open, shared, leap */
 355                 switch (wdev->conn->params.auth_type) {
 356                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 357                         if (wdev->connect_keys)
 358                                 wdev->conn->params.auth_type =
 359                                         NL80211_AUTHTYPE_SHARED_KEY;
 360                         else
 361                                 wdev->conn->params.auth_type =
 362                                         NL80211_AUTHTYPE_NETWORK_EAP;
 363                         break;
 364                 case NL80211_AUTHTYPE_SHARED_KEY:
 365                         wdev->conn->params.auth_type =
 366                                 NL80211_AUTHTYPE_NETWORK_EAP;
 367                         break;
 368                 default:
 369                         /* huh? */
 370                         wdev->conn->params.auth_type =
 371                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 372                         break;
 373                 }
 374                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 375                 schedule_work(&rdev->conn_work);
 376         } else if (status_code != WLAN_STATUS_SUCCESS) {
 377                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 378                                           status_code, false, NULL);
 379         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 380                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 381                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 382                 schedule_work(&rdev->conn_work);
 383         }
 384 }
 385
 386 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 387 {
 388         struct wiphy *wiphy = wdev->wiphy;
 389         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 390
 391         if (WARN_ON(!wdev->conn))
 392                 return false;
 393
 394         if (!wdev->conn->prev_bssid_valid)
 395                 return false;
 396
 397         /*
 398          * Some stupid APs don't accept reassoc, so we
 399          * need to fall back to trying regular assoc.
 400          */
 401         wdev->conn->prev_bssid_valid = false;
 402         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 403         schedule_work(&rdev->conn_work);
 404
 405         return true;
 406 }
 407
 408 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 409 {
 410         struct wiphy *wiphy = wdev->wiphy;
 411         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 412
 413         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 414         schedule_work(&rdev->conn_work);
 415 }
 416
 417 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 418                                const u8 *req_ie, size_t req_ie_len,
 419                                const u8 *resp_ie, size_t resp_ie_len,
 420                                u16 status, bool wextev,
 421                                struct cfg80211_bss *bss)
 422 {
 423         struct wireless_dev *wdev = dev->ieee80211_ptr;
 424         const u8 *country_ie;
 425 #ifdef CONFIG_CFG80211_WEXT
 426         union iwreq_data wrqu;
 427 #endif
 428
 429         ASSERT_WDEV_LOCK(wdev);
 430
 431         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 432                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 433                 return;
 434
 435         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 436                 return;
 437
 438         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 439                                     bssid, req_ie, req_ie_len,
 440                                     resp_ie, resp_ie_len,
 441                                     status, GFP_KERNEL);
 442
 443 #ifdef CONFIG_CFG80211_WEXT
 444         if (wextev) {
 445                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 446                         memset(&wrqu, 0, sizeof(wrqu));
 447                         wrqu.data.length = req_ie_len;
 448                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 449                 }
 450
 451                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 452                         memset(&wrqu, 0, sizeof(wrqu));
 453                         wrqu.data.length = resp_ie_len;
 454                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 455                 }
 456
 457                 memset(&wrqu, 0, sizeof(wrqu));
 458                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 459                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 460                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 461                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 462                         wdev->wext.prev_bssid_valid = true;
 463                 }
 464                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 465         }
 466 #endif
 467
 468         if (wdev->current_bss) {
 469                 cfg80211_unhold_bss(wdev->current_bss);
 470                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 471                 wdev->current_bss = NULL;
 472         }
 473
 474         if (wdev->conn)
 475                 wdev->conn->state = CFG80211_CONN_IDLE;
 476
 477         if (status != WLAN_STATUS_SUCCESS) {
 478                 wdev->sme_state = CFG80211_SME_IDLE;
 479                 if (wdev->conn)
 480                         kfree(wdev->conn->ie);
 481                 kfree(wdev->conn);
 482                 wdev->conn = NULL;
 483                 kfree(wdev->connect_keys);
 484                 wdev->connect_keys = NULL;
 485                 wdev->ssid_len = 0;
 486                 cfg80211_put_bss(wdev->wiphy, bss);
 487                 return;
 488         }
 489
 490         if (!bss)
 491                 bss = cfg80211_get_bss(wdev->wiphy,
 492                                        wdev->conn ? wdev->conn->params.channel :
 493                                        NULL,
 494                                        bssid,
 495                                        wdev->ssid, wdev->ssid_len,
 496                                        WLAN_CAPABILITY_ESS,
 497                                        WLAN_CAPABILITY_ESS);
 498
 499         if (WARN_ON(!bss))
 500                 return;
 501
 502         cfg80211_hold_bss(bss_from_pub(bss));
 503         wdev->current_bss = bss_from_pub(bss);
 504
 505         wdev->sme_state = CFG80211_SME_CONNECTED;
 506         cfg80211_upload_connect_keys(wdev);
 507
 508         rcu_read_lock();
 509         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 510         if (!country_ie) {
 511                 rcu_read_unlock();
 512                 return;
 513         }
 514
 515         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 516         rcu_read_unlock();
 517
 518         if (!country_ie)
 519                 return;
 520
 521         /*
 522          * ieee80211_bss_get_ie() ensures we can access:
 523          * - country_ie + 2, the start of the country ie data, and
 524          * - and country_ie[1] which is the IE length
 525          */
 526         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 527                             country_ie + 2, country_ie[1]);
 528         kfree(country_ie);
 529 }
 530
 531 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 532                              const u8 *req_ie, size_t req_ie_len,
 533                              const u8 *resp_ie, size_t resp_ie_len,
 534                              u16 status, gfp_t gfp)
 535 {
 536         struct wireless_dev *wdev = dev->ieee80211_ptr;
 537         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 538         struct cfg80211_event *ev;
 539         unsigned long flags;
 540
 541         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 542
 543         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 544         if (!ev)
 545                 return;
 546
 547         ev->type = EVENT_CONNECT_RESULT;
 548         if (bssid)
 549                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 550         if (req_ie_len) {
 551                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 552                 ev->cr.req_ie_len = req_ie_len;
 553                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 554         }
 555         if (resp_ie_len) {
 556                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 557                 ev->cr.resp_ie_len = resp_ie_len;
 558                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 559         }
 560         ev->cr.status = status;
 561
 562         spin_lock_irqsave(&wdev->event_lock, flags);
 563         list_add_tail(&ev->list, &wdev->event_list);
 564         spin_unlock_irqrestore(&wdev->event_lock, flags);
 565         queue_work(cfg80211_wq, &rdev->event_work);
 566 }
 567 EXPORT_SYMBOL(cfg80211_connect_result);
 568
 569 void __cfg80211_roamed(struct wireless_dev *wdev,
 570                        struct cfg80211_bss *bss,
 571                        const u8 *req_ie, size_t req_ie_len,
 572                        const u8 *resp_ie, size_t resp_ie_len)
 573 {
 574 #ifdef CONFIG_CFG80211_WEXT
 575         union iwreq_data wrqu;
 576 #endif
 577         ASSERT_WDEV_LOCK(wdev);
 578
 579         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 580                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 581                 goto out;
 582
 583         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 584                 goto out;
 585
 586         /* internal error -- how did we get to CONNECTED w/o BSS? */
 587         if (WARN_ON(!wdev->current_bss)) {
 588                 goto out;
 589         }
 590
 591         cfg80211_unhold_bss(wdev->current_bss);
 592         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 593         wdev->current_bss = NULL;
 594
 595         cfg80211_hold_bss(bss_from_pub(bss));
 596         wdev->current_bss = bss_from_pub(bss);
 597
 598         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 599                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 600                             GFP_KERNEL);
 601
 602 #ifdef CONFIG_CFG80211_WEXT
 603         if (req_ie) {
 604                 memset(&wrqu, 0, sizeof(wrqu));
 605                 wrqu.data.length = req_ie_len;
 606                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 607                                     &wrqu, req_ie);
 608         }
 609
 610         if (resp_ie) {
 611                 memset(&wrqu, 0, sizeof(wrqu));
 612                 wrqu.data.length = resp_ie_len;
 613                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 614                                     &wrqu, resp_ie);
 615         }
 616
 617         memset(&wrqu, 0, sizeof(wrqu));
 618         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 619         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 620         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 621         wdev->wext.prev_bssid_valid = true;
 622         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 623 #endif
 624
 625         return;
 626 out:
 627         cfg80211_put_bss(wdev->wiphy, bss);
 628 }
 629
 630 void cfg80211_roamed(struct net_device *dev,
 631                      struct ieee80211_channel *channel,
 632                      const u8 *bssid,
 633                      const u8 *req_ie, size_t req_ie_len,
 634                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 635 {
 636         struct wireless_dev *wdev = dev->ieee80211_ptr;
 637         struct cfg80211_bss *bss;
 638
 639         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 640
 641         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 642                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 643                                WLAN_CAPABILITY_ESS);
 644         if (WARN_ON(!bss))
 645                 return;
 646
 647         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 648                             resp_ie_len, gfp);
 649 }
 650 EXPORT_SYMBOL(cfg80211_roamed);
 651
 652 void cfg80211_roamed_bss(struct net_device *dev,
 653                          struct cfg80211_bss *bss, const u8 *req_ie,
 654                          size_t req_ie_len, const u8 *resp_ie,
 655                          size_t resp_ie_len, gfp_t gfp)
 656 {
 657         struct wireless_dev *wdev = dev->ieee80211_ptr;
 658         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 659         struct cfg80211_event *ev;
 660         unsigned long flags;
 661
 662         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 663
 664         if (WARN_ON(!bss))
 665                 return;
 666
 667         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 668         if (!ev) {
 669                 cfg80211_put_bss(wdev->wiphy, bss);
 670                 return;
 671         }
 672
 673         ev->type = EVENT_ROAMED;
 674         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 675         ev->rm.req_ie_len = req_ie_len;
 676         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 677         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 678         ev->rm.resp_ie_len = resp_ie_len;
 679         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 680         ev->rm.bss = bss;
 681
 682         spin_lock_irqsave(&wdev->event_lock, flags);
 683         list_add_tail(&ev->list, &wdev->event_list);
 684         spin_unlock_irqrestore(&wdev->event_lock, flags);
 685         queue_work(cfg80211_wq, &rdev->event_work);
 686 }
 687 EXPORT_SYMBOL(cfg80211_roamed_bss);
 688
 689 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 690                              size_t ie_len, u16 reason, bool from_ap)
 691 {
 692         struct wireless_dev *wdev = dev->ieee80211_ptr;
 693         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 694         int i;
 695 #ifdef CONFIG_CFG80211_WEXT
 696         union iwreq_data wrqu;
 697 #endif
 698
 699         ASSERT_WDEV_LOCK(wdev);
 700
 701         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 702                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 703                 return;
 704
 705         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 706                 return;
 707
 708         if (wdev->current_bss) {
 709                 cfg80211_unhold_bss(wdev->current_bss);
 710                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 711         }
 712
 713         wdev->current_bss = NULL;
 714         wdev->sme_state = CFG80211_SME_IDLE;
 715         wdev->ssid_len = 0;
 716
 717         if (wdev->conn) {
 718                 kfree(wdev->conn->ie);
 719                 wdev->conn->ie = NULL;
 720                 kfree(wdev->conn);
 721                 wdev->conn = NULL;
 722         }
 723
 724         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 725
 726         /*
 727          * Delete all the keys ... pairwise keys can't really
 728          * exist any more anyway, but default keys might.
 729          */
 730         if (rdev->ops->del_key)
 731                 for (i = 0; i < 6; i++)
 732                         rdev_del_key(rdev, dev, i, false, NULL);
 733
 734 #ifdef CONFIG_CFG80211_WEXT
 735         memset(&wrqu, 0, sizeof(wrqu));
 736         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 737         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 738         wdev->wext.connect.ssid_len = 0;
 739 #endif
 740
 741         schedule_work(&cfg80211_disconnect_work);
 742 }
 743
 744 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 745                            u8 *ie, size_t ie_len, gfp_t gfp)
 746 {
 747         struct wireless_dev *wdev = dev->ieee80211_ptr;
 748         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 749         struct cfg80211_event *ev;
 750         unsigned long flags;
 751
 752         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 753
 754         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 755         if (!ev)
 756                 return;
 757
 758         ev->type = EVENT_DISCONNECTED;
 759         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 760         ev->dc.ie_len = ie_len;
 761         memcpy((void *)ev->dc.ie, ie, ie_len);
 762         ev->dc.reason = reason;
 763
 764         spin_lock_irqsave(&wdev->event_lock, flags);
 765         list_add_tail(&ev->list, &wdev->event_list);
 766         spin_unlock_irqrestore(&wdev->event_lock, flags);
 767         queue_work(cfg80211_wq, &rdev->event_work);
 768 }
 769 EXPORT_SYMBOL(cfg80211_disconnected);
 770
 771 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 772                        struct net_device *dev,
 773                        struct cfg80211_connect_params *connect,
 774                        struct cfg80211_cached_keys *connkeys,
 775                        const u8 *prev_bssid)
 776 {
 777         struct wireless_dev *wdev = dev->ieee80211_ptr;
 778         struct cfg80211_bss *bss = NULL;
 779         int err;
 780
 781         ASSERT_WDEV_LOCK(wdev);
 782
 783         if (wdev->sme_state != CFG80211_SME_IDLE)
 784                 return -EALREADY;
 785
 786         if (WARN_ON(wdev->connect_keys)) {
 787                 kfree(wdev->connect_keys);
 788                 wdev->connect_keys = NULL;
 789         }
 790
 791         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 792                                   rdev->wiphy.ht_capa_mod_mask);
 793
 794         if (connkeys && connkeys->def >= 0) {
 795                 int idx;
 796                 u32 cipher;
 797
 798                 idx = connkeys->def;
 799                 cipher = connkeys->params[idx].cipher;
 800                 /* If given a WEP key we may need it for shared key auth */
 801                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 802                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 803                         connect->key_idx = idx;
 804                         connect->key = connkeys->params[idx].key;
 805                         connect->key_len = connkeys->params[idx].key_len;
 806
 807                         /*
 808                          * If ciphers are not set (e.g. when going through
 809                          * iwconfig), we have to set them appropriately here.
 810                          */
 811                         if (connect->crypto.cipher_group == 0)
 812                                 connect->crypto.cipher_group = cipher;
 813
 814                         if (connect->crypto.n_ciphers_pairwise == 0) {
 815                                 connect->crypto.n_ciphers_pairwise = 1;
 816                                 connect->crypto.ciphers_pairwise[0] = cipher;
 817                         }
 818                 }
 819         }
 820
 821         if (!rdev->ops->connect) {
 822                 if (!rdev->ops->auth || !rdev->ops->assoc)
 823                         return -EOPNOTSUPP;
 824
 825                 if (WARN_ON(wdev->conn))
 826                         return -EINPROGRESS;
 827
 828                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 829                 if (!wdev->conn)
 830                         return -ENOMEM;
 831
 832                 /*
 833                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 834                  */
 835                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 836                 if (connect->bssid) {
 837                         wdev->conn->params.bssid = wdev->conn->bssid;
 838                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 839                 }
 840
 841                 if (connect->ie) {
 842                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 843                                                 GFP_KERNEL);
 844                         wdev->conn->params.ie = wdev->conn->ie;
 845                         if (!wdev->conn->ie) {
 846                                 kfree(wdev->conn);
 847                                 wdev->conn = NULL;
 848                                 return -ENOMEM;
 849                         }
 850                 }
 851
 852                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 853                         wdev->conn->auto_auth = true;
 854                         /* start with open system ... should mostly work */
 855                         wdev->conn->params.auth_type =
 856                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 857                 } else {
 858                         wdev->conn->auto_auth = false;
 859                 }
 860
 861                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 862                 wdev->ssid_len = connect->ssid_len;
 863                 wdev->conn->params.ssid = wdev->ssid;
 864                 wdev->conn->params.ssid_len = connect->ssid_len;
 865
 866                 /* see if we have the bss already */
 867                 bss = cfg80211_get_conn_bss(wdev);
 868
 869                 wdev->sme_state = CFG80211_SME_CONNECTING;
 870                 wdev->connect_keys = connkeys;
 871
 872                 if (prev_bssid) {
 873                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 874                         wdev->conn->prev_bssid_valid = true;
 875                 }
 876
 877                 /* we're good if we have a matching bss struct */
 878                 if (bss) {
 879                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 880                         err = cfg80211_conn_do_work(wdev);
 881                         cfg80211_put_bss(wdev->wiphy, bss);
 882                 } else {
 883                         /* otherwise we'll need to scan for the AP first */
 884                         err = cfg80211_conn_scan(wdev);
 885                         /*
 886                          * If we can't scan right now, then we need to scan again
 887                          * after the current scan finished, since the parameters
 888                          * changed (unless we find a good AP anyway).
 889                          */
 890                         if (err == -EBUSY) {
 891                                 err = 0;
 892                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 893                         }
 894                 }
 895                 if (err) {
 896                         kfree(wdev->conn->ie);
 897                         kfree(wdev->conn);
 898                         wdev->conn = NULL;
 899                         wdev->sme_state = CFG80211_SME_IDLE;
 900                         wdev->connect_keys = NULL;
 901                         wdev->ssid_len = 0;
 902                 }
 903
 904                 return err;
 905         } else {
 906                 wdev->sme_state = CFG80211_SME_CONNECTING;
 907                 wdev->connect_keys = connkeys;
 908                 err = rdev_connect(rdev, dev, connect);
 909                 if (err) {
 910                         wdev->connect_keys = NULL;
 911                         wdev->sme_state = CFG80211_SME_IDLE;
 912                         return err;
 913                 }
 914
 915                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 916                 wdev->ssid_len = connect->ssid_len;
 917
 918                 return 0;
 919         }
 920 }
 921
 922 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 923                      struct net_device *dev,
 924                      struct cfg80211_connect_params *connect,
 925                      struct cfg80211_cached_keys *connkeys)
 926 {
 927         int err;
 928
 929         mutex_lock(&rdev->devlist_mtx);
 930         /* might request scan - scan_mtx -> wdev_mtx dependency */
 931         mutex_lock(&rdev->sched_scan_mtx);
 932         wdev_lock(dev->ieee80211_ptr);
 933         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 934         wdev_unlock(dev->ieee80211_ptr);
 935         mutex_unlock(&rdev->sched_scan_mtx);
 936         mutex_unlock(&rdev->devlist_mtx);
 937
 938         return err;
 939 }
 940
 941 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 942                           struct net_device *dev, u16 reason, bool wextev)
 943 {
 944         struct wireless_dev *wdev = dev->ieee80211_ptr;
 945         int err;
 946
 947         ASSERT_WDEV_LOCK(wdev);
 948
 949         if (wdev->sme_state == CFG80211_SME_IDLE)
 950                 return -EINVAL;
 951
 952         kfree(wdev->connect_keys);
 953         wdev->connect_keys = NULL;
 954
 955         if (!rdev->ops->disconnect) {
 956                 if (!rdev->ops->deauth)
 957                         return -EOPNOTSUPP;
 958
 959                 /* was it connected by userspace SME? */
 960                 if (!wdev->conn) {
 961                         cfg80211_mlme_down(rdev, dev);
 962                         return 0;
 963                 }
 964
 965                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 966                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 967                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 968                         wdev->sme_state = CFG80211_SME_IDLE;
 969                         kfree(wdev->conn->ie);
 970                         kfree(wdev->conn);
 971                         wdev->conn = NULL;
 972                         wdev->ssid_len = 0;
 973                         return 0;
 974                 }
 975
 976                 /* wdev->conn->params.bssid must be set if > SCANNING */
 977                 err = __cfg80211_mlme_deauth(rdev, dev,
 978                                              wdev->conn->params.bssid,
 979                                              NULL, 0, reason, false);
 980                 if (err)
 981                         return err;
 982         } else {
 983                 err = rdev_disconnect(rdev, dev, reason);
 984                 if (err)
 985                         return err;
 986         }
 987
 988         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 989                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 990         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 991                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 992                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 993                                           wextev, NULL);
 994
 995         return 0;
 996 }
 997
 998 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 999                         struct net_device *dev,
1000                         u16 reason, bool wextev)
1001 {
1002         int err;
1003
1004         wdev_lock(dev->ieee80211_ptr);
1005         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
1006         wdev_unlock(dev->ieee80211_ptr);
1007
1008         return err;
1009 }
1010
1011 void cfg80211_sme_disassoc(struct net_device *dev,
1012                            struct cfg80211_internal_bss *bss)
1013 {
1014         struct wireless_dev *wdev = dev->ieee80211_ptr;
1015         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
1016         u8 bssid[ETH_ALEN];
1017
1018         ASSERT_WDEV_LOCK(wdev);
1019
1020         if (!wdev->conn)
1021                 return;
1022
1023         if (wdev->conn->state == CFG80211_CONN_IDLE)
1024                 return;
1025
1026         /*
1027          * Ok, so the association was made by this SME -- we don't
1028          * want it any more so deauthenticate too.
1029          */
1030
1031         memcpy(bssid, bss->pub.bssid, ETH_ALEN);
1032
1033         __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
1034                                WLAN_REASON_DEAUTH_LEAVING, false);
1035 }